On Fri, Apr 2, 2010 at 8:41 PM, Chris Fields <cjfields at illinois.edu> wrote:
> Glad to see it's not just me. I just asked the same question the other
> day and got a response (or non-response, dep. on how you look at it);
> posted below. This occurs irrespective of using the BioPerl BLAST+
> modules or not, using -num-threads of 4 and 8.
>> Interestingly, the legacy BLAST and -a works just fine (I'm using a dual
> quad-core running ubuntu karmic 64-bit, 48G RAM). It may be the
> database size as they imply, but I would like to see this behavior
> documented. It's certainly unexpected.
I was running the new blastp tool from BLAST+ today on a local
copy of NR, and using -num_threads 7 worked fine. This was on
a Mac Pro, with BLAST+ compiled from source. So it might be
down to the database size as the NCBI suggested.
Peter